Hammer device



use.

July 2, 1963 G. D.- FENTON 3,095,786

HAMMER DEVICE Original Filed June 6, 1959 I fi l l ,4 2 24 12 i l 20 22 l /8 t 4( 38 v vv,- v

INVENTO/P Alforney United States Patent 1 Claim. e1. 91-4s4 This invention relates to a fluid hammer and is a division of the co-pending application of Fenton and Elmendorf, Serial No. 820,012, filed June 12, 1959. The fluid hammer is particularly suited for attaching a terminal to a cable as disclosed in the above-identified co-pending application.

It is therefore an object of my invention to provide a fluid hammer of light weight and inexpensive construction which will provide a hammer blow of maximum force in relation to the fluid pressure provided.

These and other objects should be more apparent after referring to the following specification and attached drawings in which the single FIGURE is a view, partly in section, showing the hammer of my invention and the controls therefor.

Referring more particularly to the drawing reference numeral 2 indicates a framework for supporting a cylinder 4 which is preferably mounted vertically. The cylinder 4 has a piston 6 therein which has a stop 8 on its upper end, a stop 10 on its lower end and a piston rod 12 extending downwardly through the stop 10. A release collar 14 is provided on the rod 12 intermediate its length and a staking point 16 is provided on its lower end. A guide 18 is mounted on the framework 2 so as to provide support for the piston rod 12. A horizontal cylinder 20 is mounted on framework 2 and has a release slide 22 attached to its piston rod, the slide 22 being guided in a sleeve 24 mounted on the framework 2. A support 26 is mounted below the staking point 16 for supporting a cable C having a terminal fitting F thereon. Fluid, preferably air, is delivered to the cylinders 4 tand 20 from an air line 28. Air is delivered to the return side of cylinder 20 through a three-way valve 30 with the air being exhausted from the opposite end of cylinder 20 through the vent of a similar three-way valve 32. Air is delivered to the lower side of cylinder 4 through a three-way valve 34 and a control valve 36 with air being exhausted from the top of the cylinder 4 to atmosphere through the vent of a three-way valve 38. A pressure regulator 40 and pressure gage 42 are located in line 44 leading to the top of cylinder 4.

In operation, with cable C and fitting F located directly beneath the hammer point 16, and with the parts arranged as shown, valve 38 is opened to permit air under pressure to flow to the top of cylinder 4 and valve 34 is opened to permit air to exhaust to atmosphere therethrough. The air is permitted to accumulate in the space provided by "ice stop 8 until its pressure builds up to a predetermined amount. Valve 30 is then opened to the pressure of line 28 and valve 32 opened to atmosphere. This may be done either automatically or manually and causes the release slide 22 to move from beneath collar 14, thus permitting the rod 12 to move downwardly with the staking point 16 striking the fitting F with a hammer blow to secure it to the cable C. The stop 10 limits the downward movement of the staking point 16 so as to prevent it from striking the support 26 if no fitting F is in place. The valve 34 is then opened to the pressure in line 28 and valve 38 connected to exhaust so as to return the rod 12 to its upper position. The valve 32 is then opened to the pressure of line 28 and valve 30 opened to exhaust so that the slide 22 will move forwardly under the collar 14. These movements may be accomplished either automatically or manually. Thus the parts are returned to the original position shown and are prepared for another cycle.

While one embodiment of my invention has been shown and described, it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claim.

I claim:

Apparatus providing a hammer blow comprising a cylinder, a piston in said cylinder, a piston rod attached to said piston and extending therefrom, a stop attached to said piston and extending therefrom in the direction opposite said piston rod, a collar on said piston rod outside said cylinder, a second cylinder arranged generally noranal to said first cylinder and located adjacent said collar, a piston in said second cylinder, a piston rod attached to said second named piston and extending therefrom toward said collar, means on said last named piston rod for engaging said collar, means for delivering air under pressure to said first cylinder on the side of its piston having the stop thereon, means for delivering fluid under pressure to said second cylinder on the side of said second named piston opposite its piston rod for holding its collar engaging means in engagement with said collar, and means for delivering fluid under pressure to said second cylinder on the piston rod side of said second named piston to retract said second named piston rod after the pressure in said first cylinder has built up to a predetermined amount.

References Cited in the file of this patent UNITED STATES PATENTS 2,535,588 Mead -Dec. 26, 1950 2,818,570 Foccou I an. 7, 1958 2,881,738 Baker Apr. 14, 1959 2,914,033 Powers et al Nov. 24, 1959 2,944,526 Jarvis July 12, 1960 2,947,003 Ericsson Aug. 2, 1960 FOREIGN PATENTS 547,933 Belgium June 15, 1956 1,051,749 Germany Feb. 26, 1959 

